$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10508-29063/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10508-29063/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin f62b693f9e949ef2dc75b64194ad636225e98d84:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         f62b693f9e949ef2dc75b64194ad636225e98d84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f62b693 bump release for test build